Henry kewley



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TO ALL WHOM I'l MAY CONCERN:

Be itknown that I, HENRY KEWLEY, of Perry, in the county of Lahe, andState of Ohio, have invented certain new and useful Improvements` inTubing-Clamps; and I do hereby declare that the following is a full andcomplete description of the saine, reference bcingbad to'theaccompanying drawings, making a part of this specification, in which-Figurel is'a side`view ofthe cianips.

Fig'ure 2 is :Lvertical longitudinal section.

Figure 3 is 'a top view.

Figure 4 is an under side view of the saine.

`Like letters refer to like parts in the dicrent views.

This clamp is made of iron, and is constructed in two sections, A and B,tig. 3, which are connected to each other by the hinge-joint C, by themeans of which the two sections may be opened for a purpose, as will behereafter shown. D is a pawl, pivoted between the two sections at thepoint a', and is of the shape shown in iig. 2. The face of this pawl isgroored so as toconform to the circumference ofthe eye or hole D', intowhich it is seen to project, as shown in fig. 3, this being the upperpart of the pawl, and the project-ion in fig. 4 the lower end. E is alever inserted in the pawl, by the means of which it is operated. F is aspring, for the purpose ofthrowing the pawl forward into the eye. G is abolt, by means of which the two sections are secured together. H is abrace, for the purpose'of keeping the two sections apart, so as topermit a free play of the pawl. J is a. boss o'r collar upon the underside ofthe clamp, the inner diameter of which is made largcrithan thediameter of the hole, forming thereby a reccssor.enlargement, J', at thelower end. I

A lhis implement is for tbc purpose of raising and llowering tubing intothe oil-wells or other wells in which tubing is used, and is operated asfollows: The clamp is placed upon the top ofthe curbing within thechamber, so that `the implement may rest upon the shoulder' K, andthercbybe supported, or prevented from sliding down upon the curbing.'lhe pipe or tube is introduced into the curbing through the eye or holeof the clamp, and as it descends into the well, the measure of itsdescent is controlled by the lower end of the pawlwhich is forcedagainst the tube by pulling'back thc-lever E in the direction indicatedby the dotted-lines E', fig. 2, and the speed of the descending tube isthereby controlled. When it is necessary to retain the tube at any pointin its descent, or to withdraw it from the well, the upper part ofthepawl is thrown forwardinto the position shown in the drawing. By this itis obvious that its further descent is impossible so long as the pawlremains in. this position, as the greater the weight downward, thestronger willvbe the pressure of the pawl exerted against the tube; andso, on the withdrawing ofthe tube from the well, the clamp is lifted up,and, as a consequence, the pipe is drawn up with it, for the descent ofthe tube and the lifting up of the -`'clamp alike cause the pawl to drawtight against the pipe, inorder to allow the enlargement or collar, bywhich the several sections of the pipe are connected, to pass throughthe eye.I The clamp is opened by loosening the bolt, by the means ofwhich the two sections are secured, and the clamp thereby openedsuicient-ly to admit of the passage of the joint, and, when passed,again closed together as before. y

By the use of this clamp, tubing can be let down the well with ease andsafety, and without slipping, as is the case in the old method. The moreespecial advantage derived from `this clamp is in withdrawing the tubingfrom the well. In the old way of doing thiswith tongs, it is alwaysattended with much labor, inconvenience, and trouble; in consequence ofthe slipping of the tongs, the tubing being oily, hence eutremelyslippery, it is very ditlcult to make the tongs'hold sufficiently tightto withdraw the pipe. By the use of the clamp, this diiculty is avoided,for, as above remarked, the greater the weight to be lifted the strongerlwill be the action of the pawl against the tube, and the edge ofthepawl being sharp, it cuts into the side of the tube, and thereby makingit impossible for the tube to slip.

What I claim as my improvement, and desire to secure by Letters Patent,is

The collar J, jointed sections A B, paw] D, lever E, und spring F,arranged in relation to each other in the manner and for the purpose setforth.

HENRY KEWLEY.

Witnesses:

G. W. CnownLL, O. B. Pennen.

